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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda2155043aea1f7287c526926fd9b491210229c6bf0f258a66e6c104a929b26' 
  AND token = 'Jjem69q69meyq08nMWoQD9x5cTmfmC46x/lc6l/zyyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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