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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f0f4857f2d018e7f1c6d59b6bfd09659c10d35bd5c33d4815c9511bd9bfecc' 
  AND token = 'rIrSMCy20XtL3UPsoYiOpKxCppyJVkCoNkFEgrA7dAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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