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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ecd21fc88720492594f4672ab24f88ee9dee47cb6c56db59ab021d75f643e4' 
  AND token = '4lFH+R3QUknl5H4XelDKcKCxJw2DznJAtoGyYIx6Uds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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