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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4c1a322b7ec844f9374a111fc541c3177215620ddfb19c5f3ee65f737871b9' 
  AND token = 'fsMMVqLPjOZp37BaoA0JLdNRecP5zz8vCIT3JlLabj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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