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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002ec8908fe141667036b03fcac12e50b585855c96743857462936d622f7bbb9' 
  AND token = 'yAxFea8e0/5K1mpmED3RgidEeqkq0dVorcfs15tAdCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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