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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6040ac2bd1dee83c9a3f7d978fda8e7f6771fbf520305d1bc628a2c9e068ff2' 
  AND token = 'GhjIKFReEBsH2uvWBhZ228VansqT8HkI3j6mqHo2W3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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