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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4275984ed22e9cb1967f1002f9864d7c3cb6c0d4ba54f95e99ad1c55731509f6' 
  AND token = '/pc6Y6qKRFYI0F66QNDoIxokIjGuMIHro1Rmh1ZLIHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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