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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c809d8262772bf4b1d9a099a4c26678201deee619e9b77f93480b0e9158bd72b' 
  AND token = 'dnx82/W5YCArZ9faAUcHMLp3KAkizc8VW7SfO2A/66c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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