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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3917353f3ad77663ce3c9d717943028f4da75466a8fac0360ffc7b6418b9d79' 
  AND token = 'knNelUYWf53fw9xz7FjURygQQbP/CL9NbeOuJC8J1DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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