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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb1e5121fc799d429b06e666bec94a7abda4d4e1e312c7dfc20190d01fef306' 
  AND token = 'yf9fy0NuEUARq47ch0Sfv98MgHPf3/UzMlJCfK6jtD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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