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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c5087a431a313ee97bb21b55681d8216aab1cb96af8c8232a14c6b9d113445' 
  AND token = 'Vxrkic8q4QL3D0Vt4a49OLxFY8C1NS0zD2z06Rk2Qvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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