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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5558d38da875eb49f0cecd87d31092b3de68fa613c6ed05bd06888dc9e8ed1' 
  AND token = 'pNFWCMJonxeZIjtPBMmaD+Lj//k0fVV3FKlLWai2aAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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