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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231199f972a23f26f17fb91cf1da324acf77e070ab5e9a93be0d416b8947c85e' 
  AND token = 'lonHuu0c7910042aGgiQcw/qRO1yf+GIM78kl42t+MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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