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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0bd65ab424fcb38366c6b310402d4b7ed238e96773f001d4a1295d4bd8d719' 
  AND token = '07ZC1NrEvRyV4lX3Yp/orKu0i7TMi/wi9fCPrm/hWDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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