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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb81d0371903faec6cd1a72e16d4b23051a78fb430b0b62ea230985de4577b7' 
  AND token = 'cVb3DTcGvWojICQ5OvFGpAElPx34JCjpyhTAdUt98UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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