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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2423c0bedddb977eb364fb3e62cca5d6e498ec6debfe7b08b778798b3fa062ce' 
  AND token = 'xxQpGeWtBahC+eqzMNJdRkulxRH4brTmuPZkc5LcF9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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