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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7366b7e83bc068fd60608022de47e4085fa77df9b1e9696dc8a81be3fa369fd6' 
  AND token = 'gzf/luE4VgHK793yp+h/fBA0wVwy0msGnsbMc2MWNIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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