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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936aa5c96e331fb1fbe6a14140e13f9b4d02644730d800b5808120c86f58fad3' 
  AND token = 'PNm1MOkANqrgUPbGwSXDPny8wK82VqGYto5oUctcS44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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