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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944025c734d558ac71ed6cd303fae4d102dbc0e3ddbb32b36443c78740291e52' 
  AND token = 'gK0pSIjBHjUNOT2GVmjDNjJkS8zbF0qImLzkhcvY3vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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