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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef390da65e6bc7a7977e102359374583745a6bc9cca2d8a7dcca03723989b53e' 
  AND token = 'OVlnU3ZDlTLbQrc9TlITG+O1/XHD88UUytEJITu2xJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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