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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e026d7168b3a14e67586de6ed5c229be18e193e4f551ae4f3aee52e3b2a7f6' 
  AND token = 'mjg2w6s1k8yJO/ae2dDkKEsGfd5qr8ZarDOJm/6CMNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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