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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c608eb7d9f582846ae5d40acdf5b477c441126eccf41008a9293d9798f0f3e4' 
  AND token = 'YZDVwoUsL25BIRJvRAgD9O6F8f90AyyuIC3N+k3J2ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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