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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc3c3a2f0028944c43574eae671ba3192e7a269a1342b6d4d21e7198d780c4c' 
  AND token = '9je7Y62DPxM/h9tgGuwltPD/br0M4Ldb7M3DWM1rWFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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