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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663438908f7eecfb05b77e28464d590399ab92344fe8db6e24ab157088162948' 
  AND token = 'br4U0NfdToPnPrMTy9WMeODBIiWEBiCwuY1Mcd06X58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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