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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d50fe444396674db24a544e9d420c7a20878cfbc8eed2253c882ee8649346e' 
  AND token = 'AgPEEY/CrK7AU2Brln/WNHFf6z1vySDg6lzQqIXwXCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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