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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41c7a3341a122fee39ae1c79e029f719a9f8d0bc03a30e0a55cf21640ee7b10' 
  AND token = 'kLPVSBUsbs07dUnpifvMIXp/1v1Bv6s88Ga3NCRo3ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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