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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df5224c91e33bcc801d9443e38c2c1d8eae69343501ff1edf6bea27f6f87288' 
  AND token = 'VcrkKPcQWxxNYB5aqIx7LJO62j7StfP5OSlHx7rFoIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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