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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb433fbfbd8476d631b1baecd16197aed05679fa06eee98541106a480b694d3' 
  AND token = 'KiKO80c/jPgvN6l5s7N2CYgH7btbjA9pfkHgjNWEcKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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