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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debda4b678aff7ccaf600ab5cb637e14faabf34fdbfdfcfda5c8a6a93c5dd73b' 
  AND token = 'OVvG06yxsf4D9r/rQtqC1rxJRzn0Jax3ad8xDmdkkFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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