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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060d64f2f03d144eebd2bed7a7832df5484d6c913af9e11c3262a819278246d2' 
  AND token = 'LDj4Io7qysJj2R8O/RfId6wOor2FsLv0/1VZbw7dOUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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