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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bae1f2f45f5a5555d5e9f3ff599780c28206b9d638415268172accc1cd1a47' 
  AND token = 'AN/N5vSCWyJ49UJzBhFpUOv2eA1Kkrn1jdgCiFhOnwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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