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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558bda4b6a2c9c126ffe31500274b2c5116bd00924e4b698321dead001400d08' 
  AND token = 'N1L5y7KE7EbAKWkW414Ac41ZOWbqIlTAPAfBHo+1nNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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