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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b99aaac5044a5c611341b8a483c64a0608da9e3b8eb2e2eb5053e97280fe3d' 
  AND token = 'zsgq7pa8roTWZnY/Q1P61chOJVXhZL59pghkg4UfPO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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