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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203f08ca771d853b3668204180483bc8c1058d78e898c4a1be3fbc035d532996' 
  AND token = '7wV0BuGuHHqc4xlJdJqF1DVv9ktXg4L+879CzDzrUt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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