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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb90984adbdfd29d6c487a593856e4236123b909fd7d0224ce8c3264ece88495' 
  AND token = 'G0ohnbMIMcr0jswCNMhsYwSW6GTq+FqLMkaUdh2FwpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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