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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb94557ba4cab0c8a7b8d2100a46dd03ab1796eaa35e663bfc7f0997d84962e' 
  AND token = 'mNaSgfJfmsZw9XFg6vrgpVt0yI/g0RbO/T8iK2gGCEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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