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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d2bb42312384fb9b35dd7c5eced52f1566d4431883ae665a67adfe6b70fc69' 
  AND token = '9aoGj9VTlQ+3qy9e1XTuP4VReodqvttnbIHzCOUkUcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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