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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9638ea89df7fd23af9d36d8e757270e6b1e16a57540f3c1e51a080edbd3d65c' 
  AND token = '0fqRcCmOXO1gPDqXLqKza8EURIQLTmA1Mye/yLg7quQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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