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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db4aeba0400c5d2f13e7639982d32423b941ad367a36175f49fd618f9224409' 
  AND token = '09NK0nOA4aw3U0RPfq0shTysCvVO58wEBJ64070OVHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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