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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910ae9d1c08e25a25c7d91543e420b33e62a6414b467ee4641e348724ffb6521' 
  AND token = 'bLj+IxtyxfVk4e4vvlnE0HA9ybMMLhg6eGCzedpcN5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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