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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6faffbc47de6e67ef803b987b87e5646dfbe088e144af541e757fb1a287d3d04' 
  AND token = 'HxrDWDubO8sgHICVjEkp02eHFE17RuzL3tCaBLNt+ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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