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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14fcd7d7c61da153d20ba25f90bbb00f93a0af41a479d6003bb9e74e8744ddc' 
  AND token = 'W5UimYoPlEaZFLfcZd8BeFhiJ34h58htM3DGVoCqy9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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