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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea904db4cbd053d93bdda4b588cb60d6cde461d631196e1135168d7af59511e' 
  AND token = 'Ou57T9UIz66FoNnyeqL4Syp95z2e5uJ1YTc/3jjOH4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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