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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a812c422be1c5b2c4b6d4058415dc9d694d281855c3f7e98c9a3550234eaa7' 
  AND token = '45kt4UZ66X2iJBBV8h5AI0KawPl4dXaFEZvxyh8ozFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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