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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0034f81decb7fbf6a7a7c18f99928e3aede89a92af29817db07f5537c7d6d429' 
  AND token = '1lUkYy/Z9R9o1db/4OBBeiUF5WKTUE9yLB00KPs61/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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