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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda605d949dfefee89ca36b635dc05fc6c0150e876ba5eac1c4f68295a3e764f' 
  AND token = 'Zfg06iiESk/2bEG6yd+jnWEjs7XaK3jmYijcFMUvry0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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