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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1aa3d8d8ffc2f9ca65c27e4cf6eef3d819b52564c7a01c87daf58a348036a3' 
  AND token = 'u6fNL8VnKakubfvVhbs5/TlcGL1SQRo8N5GrSRUFfVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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