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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f65bcbb0df9543ff08e952cbaa6f67c64731503f4d96a0df79197fb3bcc755d' 
  AND token = 'ygX+FCz3v4IwcT/Ffq8Qdr7ihoM7CFf4AVCrqEmBCOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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