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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec2839d98f37a354ccd8ffefcdd924cc44fb25abc172579f772c444279c74d0' 
  AND token = 'EJwjDpvd+47C5OtZLMdikjh7vNIif/EtVRRIo/jekBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}