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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f6dd09c4aa6081b8b00f24970373164347e538b199a1438026631fef8e37c3' 
  AND token = '8CamPsTnxWcd+LN7DIMwUzYWxeYTCPrztrb/A31ha7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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