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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bd658495b3a2a0e8b2189c3ada7c9f7e742feef0804a24cbc4774427ae3493' 
  AND token = 'cAnXnLWiXqci1KBg8A47NogXu/wUrbNeBKtRwx+yr4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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