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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807d5dbc9ba4dd9d4ef772c9f962f61cba012f05d77d096557e0d0a2d244caff' 
  AND token = 'ZG11Qh0zlblW9A0xtD692mzX45sYreXanacPlKCJcag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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