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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c544815b6b8c3540ef558d3fa05503e75d7b4bd69cf47751c7839fed7b74fd8' 
  AND token = '9kDKiCEdQzYXc2nBGOjARXxzIBs7ussCeprv39+MY3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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