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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492721bde7c011cd0df7ce153b340019df63d633c829b2e20da68f3334170c46' 
  AND token = 'Co9aNhkO067ochHiHmyiiLjwo9lxr+A3CrIvSBsacXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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