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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654cd3cc3e2a358c44b8ab2dc0bf13b7d3928c4f28a636bc0d9a00e23277ed7a' 
  AND token = 'LmnVD7p80SljLngM7D+E4JgjOaxJOMt5OlHSmA0Wn3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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