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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440d628b87ae12b0a5221ba95898e9f18dd2c9f58b4765c4b4c2eb2467248c72' 
  AND token = 'NZYDg3GuOexuXsZxW041iKm1gpmzqHWXMELeu7ELDUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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