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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e53b4f327f70d1551c7d54031cc84b3a7c5019d289733a1d34f6a6065598f8d' 
  AND token = 'zL7eV+dga2sSSV5r8HEudKRDe/bg9LuiuEXWluQcf9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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