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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c346d129f7ecb1958b5a8b2bc68b8170a78aa40dd2e4a6f78f5cfb0c7061cb' 
  AND token = 'Ef3rnd5FX4RfDD4Wh12MpKI56nwNq3sHPJp3BZM+gJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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