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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0f32e67d7569b9f66d4f986f4062461bdf370e546c7a066b0cdb03f7d27a9b' 
  AND token = '/YpF7BxbjFDavMO/lJz1v803pDPtwHjGvqDcEDNKMRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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