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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0f9b2bff108b3e2d58203962a6780c67d05625fdfd5dfcd2fc90452d9c6f7a' 
  AND token = 'WQ9ZvLmpvLPWuBMgWaV+HumfNtX5/gI/u+McQEqam/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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