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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3907a95c97553ed8fca4788eb019547d7c3b4edb26c33fe9def188cdc8c7af04' 
  AND token = 'jwtiIS0cdRcp6HWFE9lZrJ1DQArowP+s+R7CCLu4FBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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